Top 8 golfing-language open source projects

GolfScript/CJam-inspired stack-based programming language that can be golfed or written literately*

A golfing language that is probably terrible

Pip: an imperative code-golf language

A (mostly) complete list of languages designed for code-golfing

A stack-based esolang with condensability as well as simplicity and readability in mind.

Pocket sized programs

A golfing language that has aspects of traditional programming languages - terse, elegant, readable.

Indev golfing language